A time capsule is like a special box or container filled with things that represent a certain time period. It is buried or hidden, usually to be opened in the future so people can see what life was like back then. Full definition
Through these material choices we are brought directly into the studio, with both paintings and sculptures serving as time capsules of production. (markmooregalleryblog.com)
Legacy lets individuals create digital time capsules with video or photo memories, smart property, and cryptocurrencies that can be left behind for loved ones. (the-blockchain.com)